System and method for transporting packet in real time

Abstract

In order for a packet transporting system to transport packets for service in real time, the system estimates whether the first route for transporting the packet provides the quality of service (QoS) required by the service. If the first route is qualified to provide the QoS for transporting the packet, the system estimates whether the first route group including the first route satisfies the reliability required by the service. If the first route group is disqualified to provide the reliability required by the service, the system searches for the second route different from the first route, adds the second route to the first route group, and estimates whether the updated first route group satisfies the reliability, and if, as a result of the reliability estimation, the updated first route group is qualified to provide the reliability, transports the packet in real time by using the first route group which is comprised of the first route and the second route.

1 . A method of transporting a packet for service in real time by a packet transporting system, the method comprising:
 searching for a first route which is comprised of at least one route for transporting the packet;   estimating whether the retrieved first route provides quality of service (QoS) for transporting the packet, required by the service;   if, as a result of the QoS estimation, the retrieved first route is qualified to provide the QoS for transporting the packets, creating a first route group including the retrieved first route;   estimating whether the created first route group satisfies reliability required by the service;   if, as a result of the reliability estimation, the first route group is estimated not to satisfy the reliability required by the service, searching for a second route which is comprised of at least one route different from the first route, updating the first route group to an updated first route group including the first route and the second route, and determining whether the updated first route group satisfies the reliability; and   if, as a result of the reliability estimation, the updated first route group is estimated to satisfy the reliability, transporting the packet in real time by using the updated first route group containing the first route and the second route.   
     
     
         2 . The method of  claim 1 , further comprising transporting the packet by using only the retrieved first route, if, as a result of the reliability estimation, the first route group is estimated to satisfy the reliability required by the service. 
     
     
         3 . The method of  claim 1 , wherein estimating whether the updated first route group satisfies the reliability comprises:
 searching for the second route different from the first route;   estimating whether the retrieved second route provides the QoS, required by the service;   if, as a result of the QoS estimation, the retrieved second route is qualified to provide the QoS required by the service, creating the updated first route group by storing the second route and the first route in the first route group; and   estimating whether the updated first route group satisfies the reliability.   
     
     
         4 . The method of  claim 3 , further comprising searching for a different route from the second route, if, as a result of the QoS estimation, the retrieved second route is disqualified to provide the QoS required by the service. 
     
     
         5 . The method of  claim 1 , wherein the creating of a first route group further includes
 if, as a result of the QoS estimtation, the retrieved first route is disqualified to provide the QoS for transporting the packet:   searching for another route different from the retrieved first route;   estimating whether the searched route satisfies the quality for transporting the packet; and   including the searched route into the first route group if the searched route satisfies the quality for transporting the packet.   
     
     
         6 . A packet transporting system for transferring packets for the service in real time, comprising:
 a route search unit for searching for at least one route for transporting the packet in real time;   a QoS qualification unit for estimating whether the at least one route retrieved by the route search unit satisfies quality required by the service for transporting the packet;   a reliability estimation unit for estimating whether a route group including the at least one route estimated to satisfy the quality by the QoS qualification unit satisfies reliability required by the service;   a packet transport unit for transporting the packets by using at least one route included in the route group, if, as a result of the reliability estimation, the route group is estimated to satisfy the reliability required by the service; and   a route group storage/management unit for managing the route group, and if, as a result of the reliability estimation, the route group is estimated not to satisfy the reliability required by the service, requesting the route search unit to search for a new route.   
     
     
         7 . The system of  claim 6 , wherein the route group storage/management unit stores information about a route satisfying the quality required by the service, from among the at least one route retrieved by the route search unit, in the route group, and manages the route group, if the route group including the new route is updated to an updated route group, requests the reliability estimation unit to estimate the reliability of the updated route group, and sends information about the updated route group on which the reliability qualification has been completed to the packet transport unit. 
     
     
         8 . The system of  claim 6 , wherein the QoS qualification unit requests the route search unit to search for a new route, if the at least one route retrieved by the route search unit does not satisfy the quality. 
     
     
         9 . The system of  claim 8 , wherein the packet transport unit transports the packet by using each of a plurality of routes when the plurality of routes are retrieved by the route search unit.